Lens driving apparatus, and camera module and optical device including same

Abstract

One embodiment includes: a housing; a bobbin arranged in the housing so as to mount a lens therein; a magnet arranged in the housing; a first coil, which is arranged in the bobbin and moves in the optical axial direction according to an interaction with the magnet; an elastic member coupled with the bobbin and the housing; a second coil to which a first drive signal is applied, and moving the housing in a direction perpendicular to the optical axial direction according to the interaction with the magnet; a location sensor for sensing the strength of the magnetic field of the magnet according to the movement of the housing; and a third coil to which a second drive signal is applied, and is arranged in correspondence with the location sensor, wherein a first magnetic field, of the second coil, which is generated by the first drive signal, and a second magnetic field, of the third coil, which is generated by the second drive signal, are generated in directions offsetting each other.

The invention claimed is: 
     
       1. A lens moving apparatus, comprising:
 a housing; 
 a bobbin disposed in the housing; 
 a first coil unit disposed at the bobbin; 
 a magnet disposed at the housing and facing the first coil unit; 
 an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing; 
 a circuit board disposed under the housing; 
 a second coil unit disposed on the circuit board and facing the magnet; and 
 a support member electrically connecting the upper elastic member and the circuit board, 
 wherein the housing comprises a protrusion extending upwards from an upper surface thereof, and the protrusion is positioned farther from a center of the housing than the support member when viewed from a top. 
 
     
     
       2. The lens moving apparatus according to  claim 1 , wherein the upper elastic member comprises an outer frame coupled to the upper portion of the housing, a coupling portion coupled to one end of the support member, and a connecting portion connecting the outer frame and the coupling portion, and
 wherein the protrusion is positioned farther from the center of the housing than the coupling portion when viewed from the top. 
 
     
     
       3. The lens moving apparatus according to  claim 1 , wherein the housing comprises a stopper extending from the upper surface thereof, and the protrusion is positioned outside the stopper. 
     
     
       4. The lens moving apparatus according to  claim 3 , wherein an upper surface of the protrusion is positioned to be lower than an upper surface of the stopper and be higher than the upper elastic member. 
     
     
       5. The lens moving apparatus according to  claim 3 , wherein the coupling portion is positioned between the stopper and the protrusion. 
     
     
       6. The lens moving apparatus according to  claim 1 , wherein the housing comprises a recess depressed from an outer side thereof to accommodate a portion of the support member. 
     
     
       7. The lens moving apparatus according to  claim 3 , wherein the housing comprises a side portion and a corner portion, and the protrusion and the stopper are positioned at the corner portion. 
     
     
       8. The lens moving apparatus according to  claim 1 , comprising a cover member configured to accommodate the housing and the bobbin in an internal space thereof,
 wherein the cover member comprises a top plate, a side plate, and a round portion connecting the top plate and the side plate, and 
 wherein the protrusion overlaps the round portion of the cover member in an optical axis direction. 
 
     
     
       9. The lens moving apparatus according to  claim 1 , comprising a damper disposed on the coupling portion and the support member. 
     
     
       10. The lens moving apparatus according to  claim 1 , wherein the housing comprises four corner portions and four protrusions corresponding to four corners thereof,
 wherein support member comprises two support members disposed at one of the four corners of the housing, and 
 wherein one of the four protrusions corresponds to the two support members. 
 
     
     
       11. The lens moving apparatus according to  claim 2 , wherein the protrusion overlaps the coupling portion and the connecting portion in a direction perpendicular to an optical axis. 
     
     
       12. The lens moving apparatus according to  claim 6 , wherein the recess of the housing comprises a first region and a second region disposed under the first region, and a stepped portion is formed in the second region of the recess, and
 wherein a size of the second region in a direction perpendicular to an optical axis direction is smaller than a size of the first region. 
 
     
     
       13. The lens moving apparatus according to  claim 2 , wherein the connecting portion comprises a bent portion and the protrusion is positioned farther from the center of the housing than the connecting portion. 
     
     
       14. The lens moving apparatus according to  claim 1 , comprising:
 a base disposed under the circuit board; and 
 a first sensor unit disposed between the base and the circuit board and electrically connected to the circuit board. 
 
     
     
       15. The lens moving apparatus according to  claim 14 , comprising:
 a sensing magnet disposed on the bobbin; and 
 a second sensor unit disposed on the housing and configured to detect a magnetic force of the sensing magnet. 
 
     
     
       16. A lens moving apparatus, comprising:
 a housing comprising a protrusion extending upwards from an upper surface thereof; 
 a bobbin disposed in the housing; 
 a first coil unit disposed at the bobbin; 
 a magnet disposed at the housing and facing the first coil unit; and 
 an upper elastic member comprising an outer frame coupled to the upper portion of the housing; 
 a circuit board disposed under the housing; 
 a second coil unit disposed on the circuit board and facing the magnet; and 
 a support member electrically connecting the upper elastic member and the circuit board, 
 wherein the upper elastic member comprises:
 a coupling portion coupled to one end of the support member; and 
 a connecting portion connecting the outer frame and the coupling portion, and 
 
 wherein a distance between a center of the housing and the protrusion is greater than a distance between the center of the housing and the coupling portion of the upper elastic member when viewed from a top. 
 
     
     
       17. The lens moving apparatus according to  claim 16 , comprising a damper disposed on at least one of the coupling portion and the support member. 
     
     
       18. The lens moving apparatus according to  claim 17 , wherein a distance between the center of the housing and the damper is smaller than a distance between the center of the housing and the protrusion. 
     
     
       19. A lens moving apparatus, comprising:
 a housing comprising a side portion and a corner portion; 
 a bobbin disposed in in the housing; 
 a first coil unit disposed at the bobbin; 
 a magnet disposed at the housing and facing the first coil unit; 
 an upper elastic member coupled to the upper portion of the housing; 
 a circuit board disposed under the housing; 
 a second coil unit disposed on the circuit board and facing the magnet; and 
 a support member comprising one end coupled to the upper elastic member and electrically connecting the upper elastic member and the circuit board, 
 wherein the housing comprises a protrusion extending upwards from an upper surface of the corner portion, and an upper surface of the protrusion is positioned to be higher than the upper elastic member, and 
 wherein the protrusion is positioned at outside of the support member and the outside of the support member is opposite to an inside of the support member on which a center of the housing is located when viewed from a top. 
 
     
     
       20. A camera module, comprising:
 a lens; 
 a lens moving apparatus according to  claim 1 ; and 
 an image sensor.